The doctor was able to diagnose the disease but not the tumor since the 
OPTIONS:
- disease was hidden.
- tumor was hidden.
tumor was hidden.

The children didn't understand the material from the book so the teacher displayed the video because the 
OPTIONS:
- book was simple.
- video was simple.
video was simple.

Jason inherited a very successful family business but not Joel because 
OPTIONS:
- Jason had savvy parents.
- Joel had savvy parents.

Jason had savvy parents.